mtcpnet.c

远程登陆工具软件源码 用于远程登陆unix

	mactcp_set_frozen,
	mactcp_socket_error
    };
    TCPiopb pb;
    UDPiopb upb;
    Actual_Socket ret;
    ip_addr dstaddr;
    size_t buflen;

    /*
     * Create Socket structure.
     */
    ret = snew(struct Socket_tag);
    ret->s = 0;
    ret->fn = &fn_table;
    ret->err = noErr;
    ret->plug = plug;
    bufchain_init(&ret->output_data);
    ret->connected = 0;		       /* to start with */
    ret->writable = 0;		       /* to start with */
    ret->sending_oob = 0;
    ret->frozen = 0;
    ret->frozen_readable = 0;
    ret->localhost_only = 0;	       /* unused, but best init anyway */
    ret->pending_error = 0;
    ret->oobinline = oobinline;
    ret->oobpending = FALSE;
    ret->listener = 0;

    dstaddr = addr->hostinfo.addr[0]; /* XXX should try all of them */
    /*
     * Create a TCP stream.
     * 
     * MacTCP requires us to provide it with some buffer memory.  Page
     * 31 of the Programmer's Guide says it should be a minimum of
     * 4*MTU+1024.  Page 36 says a minimum of 4096 bytes.  Assume
     * they're both correct.
     */
    assert(addr->resolved);
    upb.ioCRefNum = mactcp.refnum;
    upb.csCode = UDPMaxMTUSize;
    upb.csParam.mtu.remoteHost = dstaddr;
    upb.csParam.mtu.userDataPtr = NULL;
    ret->err = PBControlSync((ParmBlkPtr)&upb);
    if (ret->err != noErr) return (Socket)ret;

    buflen = upb.csParam.mtu.mtuSize * 4 + 1024;
    if (buflen < 4096) buflen = 4096;
    if (mactcp_asr_upp == NULL)
	mactcp_asr_upp = NewTCPNotifyUPP(&mactcp_asr);
    GetCurrentProcess(&mactcp.self);
    pb.ioCRefNum = mactcp.refnum;
    pb.csCode = TCPCreate;
    pb.csParam.create.rcvBuff = snewn(buflen, char);
    pb.csParam.create.rcvBuffLen = buflen;
    pb.csParam.create.notifyProc = mactcp_asr_upp;
    pb.csParam.create.userDataPtr = (Ptr)ret;
    ret->err = PBControlSync((ParmBlkPtr)&pb);
    if (ret->err != noErr) return (Socket)ret;
    ret->s = pb.tcpStream;

    /*
     * Open the connection.
     */
    pb.ioCRefNum = mactcp.refnum;
    pb.csCode = TCPActiveOpen;
    pb.tcpStream = ret->s;
    pb.csParam.open.validityFlags = 0;
    pb.csParam.open.remoteHost = dstaddr;
    pb.csParam.open.remotePort = port;
    pb.csParam.open.localPort = privport ? 1023 : 0;
    pb.csParam.open.dontFrag = FALSE;
    pb.csParam.open.timeToLive = 0;
    pb.csParam.open.security = 0;
    pb.csParam.open.optionCnt = 0;
    pb.csParam.open.userDataPtr = (Ptr)ret;
    while (1) {
	ret->err = PBControlSync((ParmBlkPtr)&pb);
	if (!privport || ret->err != duplicateSocket)
	    break;
	pb.csParam.open.localPort--;
	if (pb.csParam.open.localPort == 0)
	    break;
    }

    if (ret->err != noErr) return (Socket)ret;

    ret->connected = TRUE;
    ret->writable = TRUE;

    /* Add this to the list of all sockets */
    ret->next = mactcp.socklist;
    ret->prev = &mactcp.socklist;
    if (ret->next != NULL)
	ret->next->prev = &ret->next;
    mactcp.socklist = ret;

    sk_addr_free(addr); /* don't need this anymore */

    return (Socket)ret;
}

Socket mactcp_newlistener(char *srcaddr, int port, Plug plug,
			  int local_host_only)
{

    fatalbox("mactcp_newlistener");
}

static void mactcp_close(Socket sock)
{
    Actual_Socket s = (Actual_Socket)sock;
    TCPiopb pb;

    /*
     * TCPClose is equivalent to shutdown(fd, SHUT_WR), and hence
     * leaves the Rx side open, while TCPAbort seems rather vicious,
     * throwing away Tx data that haven't been ACKed yet.  We do both
     * in succession.
     */
    pb.ioCRefNum = mactcp.refnum;
    pb.csCode = TCPClose;
    pb.tcpStream = s->s;
    pb.csParam.close.validityFlags = 0;
    pb.csParam.close.userDataPtr = (Ptr)s;
    s->err = PBControlSync((ParmBlkPtr)&pb);
    /* Not much we can do about an error anyway. */

    pb.ioCRefNum = mactcp.refnum;
    pb.csCode = TCPAbort;
    pb.tcpStream = s->s;
    pb.csParam.abort.userDataPtr = (Ptr)s;
    s->err = PBControlSync((ParmBlkPtr)&pb);
    /* Even less we can do about an error here. */

    pb.ioCRefNum = mactcp.refnum;
    pb.csCode = TCPRelease;
    pb.tcpStream = s->s;
    pb.csParam.create.userDataPtr = (Ptr)s;
    s->err = PBControlSync((ParmBlkPtr)&pb);
    if (s->err == noErr)
	sfree(pb.csParam.create.rcvBuff);

    /* Unhitch from list of sockets */
    *s->prev = s->next;
    if (s->next != NULL)
	s->next->prev = s->prev;

    sfree(s);
}

static int mactcp_write(Socket sock, char const *buf, int len)
{
    Actual_Socket s = (Actual_Socket) sock;
    wdsEntry wds[2];
    TCPiopb pb;

    /* 
     * Casting away const from buf should be safe -- MacTCP won't
     * write to it.
     */
    wds[0].length = len;
    wds[0].ptr = (char *)buf;
    wds[1].length = 0;

    pb.ioCRefNum = mactcp.refnum;
    pb.csCode = TCPSend;
    pb.tcpStream = s->s;
    pb.csParam.send.validityFlags = 0;
    pb.csParam.send.pushFlag = TRUE; /* XXX we want it to return. */
    pb.csParam.send.urgentFlag = 0;
    pb.csParam.send.wdsPtr = (Ptr)wds;
    pb.csParam.send.userDataPtr = (Ptr)s;
    s->err = PBControlSync((ParmBlkPtr)&pb);
    return 0;
}

static int mactcp_write_oob(Socket sock, char const *buf, int len)
{

    fatalbox("mactcp_write_oob");
}

static pascal void mactcp_asr(StreamPtr str, unsigned short event, Ptr cookie, 
			      unsigned short termin_reason,
			      struct ICMPReport *icmp)
{

    WakeUpProcess(&mactcp.self);
}
			      
/*
 * Called from our event loop if there's work to do.
 */
void mactcp_poll(void)
{
    Actual_Socket s, next;
    TCPiopb pb;

    for (s = mactcp.socklist; s != NULL; s = next) {
	next = s->next;
	do {
	    pb.ioCRefNum = mactcp.refnum;
	    pb.csCode = TCPStatus;
	    pb.tcpStream = s->s;
	    pb.csParam.status.userDataPtr = (Ptr)s;
	    s->err = PBControlSync((ParmBlkPtr)&pb);
	    if (s->err != noErr)
		goto next_socket;
	    if (pb.csParam.status.amtUnreadData == 0)
		break;
	    mactcp_recv(s, pb.csParam.status.amtUnreadData);
	} while (TRUE);
	switch (pb.csParam.status.connectionState) {
	  case TCPS_CLOSE_WAIT:
	    /* Remote end has sent us a FIN */
	    plug_closing(s->plug, NULL, 0, 0);
	}
      next_socket:
	;
    }
}

static void mactcp_recv(Actual_Socket s, size_t len)
{
    rdsEntry rds[2];
    TCPiopb pb;

    if (s->frozen) return;

    while (len > 0) {
	pb.ioCRefNum = mactcp.refnum;
	pb.csCode = TCPNoCopyRcv;
	pb.tcpStream = s->s;
	pb.csParam.receive.commandTimeoutValue = 0;
	pb.csParam.receive.rdsPtr = (Ptr)rds;
	pb.csParam.receive.rdsLength = lenof(rds) - 1;
	pb.csParam.receive.userDataPtr = (Ptr)s;
	s->err = PBControlSync((ParmBlkPtr)&pb);
	if (s->err != noErr)
	    return;
	plug_receive(s->plug, 0, rds[0].ptr, rds[0].length);
	len -= rds[0].length;
	pb.csCode = TCPRcvBfrReturn;
	s->err = PBControlSync((ParmBlkPtr)&pb);
	if (s->err != noErr)
	    return;
    }	
}

/*
 * Each socket abstraction contains a `void *' private field in
 * which the client can keep state.
 */
static void mactcp_set_private_ptr(Socket sock, void *ptr)
{
    Actual_Socket s = (Actual_Socket) sock;
    s->private_ptr = ptr;
}

static void *mactcp_get_private_ptr(Socket sock)
{
    Actual_Socket s = (Actual_Socket) sock;
    return s->private_ptr;
}

/*
 * Special error values are returned from mactcp_namelookup and
 * mactcp_new if there's a problem. These functions extract an error
 * message, or return NULL if there's no problem.
 */
char *mactcp_addr_error(SockAddr addr)
{
    static char buf[64];

    switch (addr->hostinfo.rtnCode) {
      case noErr:
	return NULL;
      case nameSyntaxErr:
	return "Name syntax error";
      case noNameServer:
	return "No name server found";
      case authNameErr:
	return "Domain name does not exist";
      case noAnsErr:
	return "No answer from domain name server";
      case dnrErr:
	return "Domain name server returned an error";
      case outOfMemory:
	return "Out of memory";
      default:
	sprintf(buf, "Unknown DNR error %d", addr->hostinfo.rtnCode);
	return buf;
    }
}

static const char *mactcp_socket_error(Socket sock)
{
    static char buf[64];
    Actual_Socket s = (Actual_Socket) sock;

    switch (s->err) {
      case noErr:
	return NULL;
      case insufficientResources:
	return "Insufficient resources to open TCP stream";
      case duplicateSocket:
	return "Duplicate socket";
      case openFailed:
	return "Connection failed while opening";
      default:
	sprintf(buf, "Unknown MacTCP error %d", s->err);
	return buf;
    }
}

static void mactcp_set_frozen(Socket sock, int is_frozen)
{
    Actual_Socket s = (Actual_Socket) sock;

    if (s->frozen == is_frozen)
	return;
    s->frozen = is_frozen;
}

/*
 * Bits below here would usually be in dnr.c, shipped with the MacTCP
 * SDK, but its convenient not to require that, and since we assume
 * System 7 we can actually simplify things a lot.
 */

static OSErr OpenResolver(char *hosts_file)
{
    short vrefnum;
    long dirid;
    HParamBlockRec pb;
    Str255 filename;
    OSErr err;
    int fd;
    Handle dnr_handle;

    if (mactcp.dnr_handle != NULL)
	return noErr;

    err = FindFolder(kOnSystemDisk, kControlPanelFolderType, FALSE, &vrefnum,
		     &dirid);
    if (err != noErr) return err;

    /*
     * Might be better to use PBCatSearch here, but it's not always
     * available.
     */
    pb.fileParam.ioCompletion = NULL;
    pb.fileParam.ioNamePtr = filename;
    pb.fileParam.ioVRefNum = vrefnum;
    pb.fileParam.ioFDirIndex = 1;
    pb.fileParam.ioDirID = dirid;
    fd = -1;

    while (PBHGetFInfoSync(&pb) == noErr) {
	if (pb.fileParam.ioFlFndrInfo.fdType == 'cdev' &&
	    pb.fileParam.ioFlFndrInfo.fdCreator == 'ztcp') {
	    fd = HOpenResFile(vrefnum, dirid, filename, fsRdPerm);
	    if (fd == -1) continue;
	    dnr_handle = Get1IndResource('dnrp', 1);
	    if (dnr_handle != NULL)
		break;
	    CloseResFile(fd);
	    fd = -1;
	}
	pb.fileParam.ioDirID = dirid;
	pb.fileParam.ioFDirIndex++;
    }
    if (fd == -1)
	return fnfErr;
    
    DetachResource(dnr_handle);
    CloseResFile(fd);

    MoveHHi(dnr_handle);
    HLock(dnr_handle);

    err = InvokeOpenResolverUPP(OPENRESOLVER, hosts_file,
				(OpenResolverUPP)*dnr_handle);
    if (err != noErr) {
	HUnlock(dnr_handle);
	DisposeHandle(dnr_handle);
	return err;
    }

    mactcp.dnr_handle = dnr_handle;
    return noErr;
}

OSErr CloseResolver(void)
{
    Handle dnr_handle = mactcp.dnr_handle;
    OSErr err;

    if (mactcp.dnr_handle == NULL)
	return notOpenErr;

    err = InvokeCloseResolverUPP(CLOSERESOLVER,
				 (CloseResolverUPP)*mactcp.dnr_handle);
    if (err != noErr)
	return err;

    mactcp.dnr_handle = NULL;
    HUnlock(dnr_handle);
    DisposeHandle(dnr_handle);
    return noErr;
}

#endif

/*
 * Local Variables:
 * c-file-style: "simon"
 * End:
 */